U.S. patent number 6,209,773 [Application Number 09/391,297] was granted by the patent office on 2001-04-03 for surgical stapling instrument and method thereof.
This patent grant is currently assigned to Heartport, Inc.. Invention is credited to Lee R. Bolduc, Christopher F. Heck.
United States Patent |
6,209,773 |
Bolduc , et al. |
April 3, 2001 |
Surgical stapling instrument and method thereof
Abstract
A stapler for stapling a tubular structure to another structure.
The stapler has an anvil which is expandable from a collapsed
position to an expanded position. The stapler has a recess which
receives at least a portion of the tubular structure and a shoulder
which receives an everted end of the tubular structure. A first
actuator moves the anvil relative to the shoulder for compressing
the structures which are to be stapled together. A second actuator
is used for driving the staples through the structures to be
stapled together.
Inventors: |
Bolduc; Lee R. (Mountain View,
CA), Heck; Christopher F. (Columbus, OH) |
Assignee: |
Heartport, Inc. (Redwood City,
CA)
|
Family
ID: |
24392565 |
Appl.
No.: |
09/391,297 |
Filed: |
September 7, 1999 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
045673 |
Mar 20, 1998 |
|
|
|
|
597691 |
Feb 6, 1996 |
5732872 |
|
|
|
550285 |
Oct 31, 1995 |
5709335 |
|
|
|
261167 |
Jun 17, 1994 |
|
|
|
|
Current U.S.
Class: |
227/176.1;
227/179.1; 227/19; 606/219 |
Current CPC
Class: |
A61B
17/0644 (20130101); A61B 17/115 (20130101); A61B
17/1152 (20130101); A61B 17/1155 (20130101); A61B
2017/00243 (20130101); A61B 2017/00252 (20130101); A61B
2017/081 (20130101); A61B 2017/1103 (20130101); A61B
2017/1107 (20130101); A61B 2017/1135 (20130101); A61F
2/064 (20130101) |
Current International
Class: |
A61B
17/115 (20060101); A61B 17/03 (20060101); A61B
17/11 (20060101); A61F 2/06 (20060101); A61B
17/00 (20060101); A61B 17/08 (20060101); A61B
017/068 () |
Field of
Search: |
;227/19,175.1,176.1,178.1,179.1,180.1 ;606/219,139 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
0 137 685 |
|
Apr 1985 |
|
EP |
|
2 038 692 |
|
Jul 1980 |
|
GB |
|
2108418 |
|
May 1983 |
|
GB |
|
7711347 |
|
Oct 1977 |
|
NL |
|
99576 |
|
Feb 1983 |
|
SU |
|
109 7301 |
|
Jun 1984 |
|
SU |
|
Other References
Vogelfanger, et al., "A Concept of Automation in Vascular Surgery:
A Preliminary Report on a Mechanical Instrument for Arterial
Anastomosis"; Canadian Journal of Surgery; vol. 1; Apr. 1958; pp.
262-265. .
Holt, et al., "A New Technique for End-To-End Anastomosis of Small
Arteries," Surgical Forum, v. 11, 1960, pp. 242, 243. .
Kirsch, et al., "A New Method for Microvascular Anastomosis: Report
of Experimental and Clinical Research," The American Surgeon, vol.
58, No. 12, Dec. 1992, pp. 722-727..
|
Primary Examiner: Smith; Scott A.
Attorney, Agent or Firm: Hoekendijk; Jens E.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application, Ser. No.
09/045,673, filed Mar. 20, 1998, which is a continuation of
application Ser. No. 08/597,691, filed Feb. 6, 1996, now issued as
U.S. Pat. No. 5,732,872, which is a continuation-in-part of Ser.
No. 08/550,285, filed Oct. 31, 1995, now issued as U.S. Pat. No.
5,709,335, which is a continuation of Ser. No. 08/261,167, filed
Jun. 17, 1994, now abandoned.
Claims
What is claimed is:
1. A method of attaching a graft to a body structure comprising the
steps of:
providing a stapler having an anvil, a rod, a staple pusher and a
shoulder, the anvil being attached to the rod and the staple pusher
being configured to drive staples, the shoulder being positioned
opposite the anvil;
positioning the rod in a graft;
everting the end of the graft around the shoulder;
inserting the anvil through an opening in a body structure to which
the graft is to be stapled such that an inner surface of the graft
is adjacent an outer surface of the body structure;
compressing the graft and the body structure between the anvil and
the shoulder; and
moving the staple pusher so that the staple pusher engages the
staples and drives the staples against the anvil thereby stapling
the graft to the body structure.
2. The method of claim 1, wherein:
the compressing and firing steps are independent of one
another.
3. The method of claim 1, wherein:
the compressing step is carried out by moving the anvil.
4. The method of claim 1, wherein:
the providing step is carried out with the anvil having a plurality
of segments, the segments being movable between an expanded shape
and a compressed shape.
5. The method of claim 4, further comprising the step of:
expanding the anvil segments from the expanded shape to the
compressed shape after the moving step.
6. The method of claim 5, wherein:
the providing step is carried out with the stapler having an
expander longitudinally movable with respect to the plurality of
segments;
the expanding step being carried out by moving the expander
longitudinally to engage and expand the anvil segments.
7. A method of attaching a graft to a body structure, comprising
the steps of:
providing a stapler having a rod, a plurality of anvil segments, a
movable staple pusher and a shoulder, each of the plurality of
anvil segments having a recess adapted to deform a staple, the
staple pusher being configured to drive a plurality of staples
toward the recesses of the plurality of anvil segments, the
shoulder being positioned opposite the anvil, the plurality of
anvil segments being mounted to the rod and being movable between
an expanded position and a collapsed position;
positioning the rod in a graft;
everting an end of the graft around the shoulder;
inserting the plurality of anvil segments through an opening in a
body structure to which the graft is to be stapled, the plurality
of anvil segments being inserted into the body structure in the
collapsed position such that an inner surface of the graft is
adjacent an outer surface of the body structure;
compressing the graft and the body structure between the plurality
of anvil segments and the shoulder;
expanding the plurality of anvil segments to the expanded
shape;
moving the staple pusher so that the staple pusher engages the
staples and drives the staples against the plurality of anvil
segments;
collapsing the plurality of anvil segments from the expanded shape
to the collapsed shape after the moving step; and
removing the rod from the graft when after the collapsing step.
8. The method of claim 7, wherein:
the providing step is carried out with the stapler having an
expander, the expander being slidably coupled to the plurality of
anvil segments for moving the plurality of anvil segments between
the expanded and collapsed positions.
9. The method of claim 8, wherein:
the compressing and moving steps are performed independently.
Description
FIELD OF THE INVENTION
The invention relates generally to surgical stapling appliances and
more particularly to an improved apparatus and method for the
anastomotic surgical stapling of luminal organs, such as vascular
lumens.
BACKGROUND OF THE INVENTION
Various instruments are known in the prior art for end-to-end and
end-to-side anastomotic surgical stapling together of parts of the
alimentary canal (i.e., esophagus, stomach, colon, etc.). These
instruments employ staple cartridges, generally in the shape of a
hollow cylinder, of different sizes to accommodate tubular organs
of varying diameters. End-to-end and end-to-side anastomoses are
achieved by means of at least one ring of surgical staples.
The traditional technique for surgical stapling anastomosis is to
position the stapling cartridge within the tubular organ to be
stapled. The cut end of the tubular organ is inverted (i.e., folded
inwardly) over the annular end of the staple cartridge creating an
inverting anastomosis upon stapling. An essential requirement of
the inverting anastomotic technique is the incorporation of knives
within the staple cartridge housing to trim excess tissue from the
anastomotic connection.
The prior art anastomotic stapling instruments form generally
circular anastomotic connections, and have been largely limited to
alimentary organs. With respect to end-to-side vascular
anastomosis, circular connections, rather than an elliptical
connections, are sometimes disadvantageous as they are less
physiologic or natural. This unnatural connection may create
turbulence in the blood flow as it courses through the anastomosis,
damaging the intima (i.e., inner wall) of the blood vessel and
predisposing it to forming blood clots.
In the present state of the art, end-to-end and end-to-side
anastomosis between blood vessels have typically been accomplished
by hand-sewn suturing techniques. These techniques are time
consuming, not as reliable as stapling, and subject to greater
human error than stapling. Current stapling instruments used for
alimentary canal are not suitable, however, for vascular
anastomosis due to their large sizes and inability to provide
non-circular and low turbulence anastomoses. A typical prior art
instrument has a circumference of approximately 8 cm (3 in), far
too thick to accommodate coronary arteries and veins, which have
circumferences ranging from 0.50 to 1.0 cm and from 1.5 to 2.5 cm,
respectively.
An additional drawback of prior stapling instruments is the
inability to provide an everted (i.e., folded outwardly)
anastomosis. An inverted vascular anastomosis would expose the cut
ends of the blood vessels to the vessel lumen and could lead to the
formation of blood clots. For this reason, hand-sewn everted
anastomoses for vascular connections are preferable, despite time
and reliability drawbacks.
Accordingly, it is a general object of the present invention to
provide an improved instrument and method for vascular
anastomosis.
It is also an object of the present invention to provide a surgical
stapling instrument small enough to accommodate vascular
lumens.
Another object of the present invention is to provide a surgical
stapling instrument for everted anastomosis.
Another object of the present invention is to provide a method for
surgical stapling that does not require the removal of excess
tissue from the anastomotical connection.
Still another object of the present invention is to provide an
instrument and method for vascular anastomosis that is less
time-consuming and more reliable than the prior art.
SUMMARY OF THE INVENTION
The present invention provides a novel instrument and method for
vascular anastomoses which overcomes the drawbacks of prior art
designs and achieves the aforesaid advantages.
Very generally, the surgical stapling instrument of the present
invention is for stapling a tubular tissue structure having at
least one distal end to a luminal structure, such as a vascular
lumen or another tubular tissue structure. The instrument comprises
a rod having a circumference sufficient to pass within the tubular
tissue structure, an anvil mounted on the rod, and a generally
tubular staple cartridge for containing a plurality of staples. The
anvil has an array of staple deforming means thereon and is of a
size sufficient to pass through a surgically formed opening in and
to be accommodated within the luminal structure. The inner passage
of the staple cartridge is sufficient to axially accommodate the
tubular tissue structure between the rod and the inner surface of
the staple cartridge, and sufficient to allow the staple cartridge
to be moved axially along the rod. The staple delivery end of the
staple cartridge is positioned toward the staple deforming means of
the anvil and has an outer dimension small enough so that the
tubular tissue structure can be everted thereover. A clamping
mechanism secures the everted portion of the tubular tissue
structure and the luminal structure adjacent to the surgically
formed opening between the staple cartridge and the anvil. A
plurality of staples may then be ejected to pass through the
everted portion of the tubular tissue structure and the luminal
structure to engage the staple deforming means to deform the
staples and create a bond between the tubular tissue structure and
the luminal structure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary side elevation view, in cross section, of
one embodiment of the anastomosis device constructed in accordance
with the present invention and illustrating an end of the tubular
tissue structure everted over the device end.
FIG. 2 is a front elevation view, in cross-section, of the
anastomosis device taken substantially along the plane of the line
3--3 in FIG. 1
FIG. 3 is a rear elevation view, in cross-section, of the
anastomosis device taken substantially along the plane of the line
2--2 in FIG. 1
FIG. 4 is a side elevation view, in cross-section, of the anvil of
the anastomosis device taken substantially along the plane of the
line 4--4 in FIG. 3
FIG. 5 is a front elevation view, in cross-section, of an
alternative embodiment of FIG. 3 illustrating a tear drop-shaped
configuration.
FIG. 6 is a rear elevation view, in cross-section, of the anvil of
the alternative embodiment of FIG. 5 taken substantially along the
plane of the line 2--2 in FIG. 1
FIG. 7 is an exploded top perspective view, partially cut-away, of
the anastomosis device of FIG. 1.
FIG. 8 is an enlarged, exploded, top perspective view, partially
cut-away, of a staple cartridge assembly of the anastomosis device
of FIG. 1.
FIG. 9 is an enlarged, side elevation view, in cross-section, of
the anvil and staple cartridge assembly of the anastomosis device
of FIG. 1 illustrating the deformation of a staple.
FIGS. 10-12 is a sequence of top perspective views illustrating the
loading of a tubular tissue structure in the anastomosis device of
FIG. 1
FIG. 13 is an enlarged, side elevation view, in partial
cross-section, showing the positioning of the anvil of the
anastomosis device through a luminal structure.
FIG. 14 is a reduced top perspective view of the anastomosis device
of FIG. 1 mounted to the luminal structure.
FIG. 15 is a reduced top perspective view of the tubular tissue
structure anastomotized to the luminal structure using the
anastomosis device of FIG. 1.
FIG. 16 is a front elevation view of a grafted tubular tissue
structure anastomotized to a coronary artery of the heart through
the anastomosis device of FIG. 1.
FIG. 17 is an exploded top perspective view of an alternative
embodiment of the anastomosis device of the present invention.
FIG. 18 is a fragmentary, enlarged top perspective view of a staple
cartridge assembly of the alternative embodiment anastomosis device
of FIG. 17.
FIG. 19 is an end view of the staple cartridge assembly of FIG.
18.
FIGS. 20-22, 24, 25, 27 and 28 is sequence of top perspective views
illustrating the application of the alternative embodiment
anastomosis device of FIG. 17 for proximal anastomosis of the
grafted tubular tissue structure to the ascending aorta.
FIGS. 23 and 26 is a sequence of fragmentary, top perspective views
illustrating the loading of a tubular tissue structure in the
alternative embodiment anastomosis device of FIG. 17.
FIG. 29 is a cross-sectional view of another stapler.
FIG. 30 is a cross-sectional view of a distal end of the stapler of
FIG. 30.
FIG. 31 is a cross-sectional view of FIG. 30 along line I--I.
FIG. 32 is a cross-sectional view of FIG. 30 along line II--II.
FIG. 33 shows a staple.
FIG. 34 is a top view of the staple.
FIG. 35 is a cross-sectional view of a rod having a graft attached
thereto.
FIG. 36 shows the distal end of the graft everted around the
shoulder.
FIG. 37 shows the staples penetrating the graft and engaging an
anvil.
FIG. 38 is a longitudinal cross-sectional view of yet another
stapler.
FIG. 39 shows the anvil in a collapsed position.
FIG. 40 shows the anvil in an expanded position.
FIG. 41 is a cross-sectional view of FIG. 38 along line
III--III.
FIG. 42 is a cross-sectional view of FIG. 39 along line IV--IV.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1-7, there is shown a structural embodiment of
the present invention which is best suited for anastomotic stapling
of a tubular vessel having two distal or untethered ends. As will
be evidenced by the detailed description below, this embodiment,
i.e., distal stapler, is ideal for use during cardiopulmonary
bypass surgery for making the primary anastomotic connection of a
bypass vein to a coronary artery or to the aorta.
Referring now to FIG. 1, a portion 10 of the wholly configured
distal stapler of the present invention, as shown in FIG. 7,
comprises an elongated central rod 12 with anvil 14 mounted at its
distal end 16. Anvil 14 is in the form of a circular, elliptical or
tear drop-shaped disk and is mounted, by suitable means such as
welding, to the end of central rod 12 transversely thereof and at
the center of the anvil. The edges of anvil 14 are beveled or
otherwise generally rounded to enable anvil 14 to slip easily
through incisions in vascular walls--much like a button through a
button hole.
The central rod 12 has a circumference sufficient to permit the rod
to axially extend through a tubular vessel, indicated in phantom at
20, to be stapled. Central rod 12 also axially extends within
tubular housing 22, driver pins 24 and staple cartridge 26,
together forming a contiguous shaft 28 having an inner
circumference sufficient to accommodate tubular vessel 20
sandwiched between them and central rod 12. Staple cartridge 26 has
an outer circumference sufficient to accommodate everted end 34 of
tubular vessel 20. Lip 36 of cartridge 26 is tapered to facilitate
eversion of tubular vessel 20. Anvil 14 has circumference of a size
equivalent to the outer circumference of staple cartridge 16.
Circumferences of vascular vessels range from 0.50 to 1.0 cm for
coronary arteries and from 1.5 to 2.5 cm for veins. Accordingly,
all circumferences, discussed above, of stapler 10 are of a size to
optimally coaxially accommodate the vein to be stapled.
The end of central rod 12 opposite anvil 14 is centrally mounted,
preferably welded, on a cylindrical base 40 which extends coaxially
within tubular housing 22 (as shown in FIG. 7 by reference number
106) and has a circumference sufficient to be slidable within
tubular housing 22. The accommodated tubular vessel 20 extends
along central rod 12 to cylindrical base 40. Provided on the
surface of central rod 12 proximal to base 40 is circumferential
groove 44 for facilitating the securing of tubular vessel 20 to rod
12 by means of string 46. Similarly, circumferential groove 48 and
string 50 are provided to secure everted end 34 of vessel 20 to
staple cartridge 26. An alternative embodiment of staple cartridge
26 for securing an everted vein comprises tiny hooks around the
circumference at end 36 of the cartridge. Other suitable means for
accomplishing the securing function may be used as well.
Referring now to FIG. 2, there is shown a cross-sectional view of
stapler 10 of the present invention in the direction of arrows 2--2
of FIG. 1. Here, the staple delivery end 60 of a circular staple
cartridge is illustrated encasing a circular array of staple
delivery means or staple shafts 62. The present invention is not
limited to a single staple shaft array, however. It is commonly
known in the art to employ a plurality of concentric arrays or rows
of staple shafts for anastomotic procedures. Extending from staple
shaft array 62, is an array of narrow channels 68, each narrow
channel corresponding to each staple shaft. Channel array 68 is
used solely for manufacturing purposes and is not a necessary
element of the invention. Central rod 64 and its base 66 are
axially and centrally located within the cylindrical staple
cartridge 60.
FIG. 3 shows the underside view of anvil 70 in the direction of
arrows 3--3 of FIG. 1. The anvil 70 has an array 74 of means for
deforming staples. Central rod attachment 72 is centrally located
on anvil 70 which provides an array of staple deforming means 74,
comprised here of an array of recess pairs, for bending staples
projected from corresponding array of staple shafts 62 of the
staple cartridge of FIG. 2.
Depicted in FIG. 4 is a cross-sectional view of anvil 70 in the
direction of arrows 4--4 of FIG. 3. Each recess pair 76 is curved
to bend staple legs radially inward. The projected staples can be
made to bend radially inward or radially outward depending on the
spacing 78 between the recess of each paired recess 76.
Alternatively, each recess can be positioned orthogonal to its
present position to bend the staple legs at right angles to their
axis of projection.
Although the present invention is primarily described and depicted
as forming staple bonds that are circular and as having component
circumferences that are circular, other embodiments are realized
for forming staple bonds having elliptical, tear drop or other
generally oval circumferences. Accordingly, the anvil and
associated staple recess array, and the cartridge housing and
associated staple shaft array of these alternative stapler
embodiments have circumferences in the shape of the desired staple
bond. For example, FIGS. 5 and 6 illustrate an anvil and staple
cartridge, respectively, having tear-drop shaped
circumferences.
FIG. 5 shows a cross-sectional view of a tear-drop shaped staple
cartridge. The staple delivery end 80 of the staple cartridge is
illustrated encasing a tear drop array of staple delivery means or
staple shafts 82. Extending from staple shaft array 82, is an array
of narrow channels 84, each narrow channel corresponding to each
staple shaft. Channel array 84 is used solely for manufacturing
purposes and is not a necessary element of the invention. Central
rod 86 and its base 88 are coaxially and centrally located within
the cylindrical portion of dear drop staple cartridge 80.
FIG. 6 shows the underside view of a tear drop shaped anvil 90.
Central rod attachment 92 is centrally located on the circular
portion of anvil 90 which provides an array of staple deforming
means comprised of recess pairs 94 for bending staples projected
from corresponding array of staple shafts 82 of the staple
cartridge of FIG. 5.
Referring now to FIG. 7, there is shown stapler 100 of the same
embodiment depicted in FIGS. 1-4. A tubular housing 102 coaxially
contains central rod 104 and rod base 106, the end of central rod
104 opposite that of anvil 114 being suitably mounted, such as by
welding, to rod base 106 (connection not shown). Threadedly mounted
to and extending perpendicular from rod base 106 is a short stem
108, positioned at approximately half the length of base 106. The
top of stem 108 has cylindrical knob 110 transversely mounted. Stem
108 is moveable within narrow channel 112, cut within housing 102
and running parallel to the axis traveled by central rod 104 and
rod base 106. Channel 112 limits the rotational movement of stem
108 and thereby maintains a proper radial orientation between anvil
114 and staple cartridge 116 during reciprocation.
Weldedly mounted to and protruding perpendicularly from cylindrical
face 118 of housing 102 and paralleling rod 104 is cylindrical
array of staple driver pins 120, all drivers pins being identical
and each having the form of a solid parallelogram. Staple cartridge
116 encases, from end to end, cylindrical array of hollow staple
shafts 122 which holds a plurality of preloaded staples (not
pictured). All shafts 122 are identical and each has height and
width dimensions such that a corresponding staple driver pin 120 is
slidable therein.
In order to have an optimally functioning stapler, it is necessary
to maintain a clean and clear passageway for central rod 104, base
106 and staple shafts 122. Accordingly, one embodiment of the
present invention comprises a disposable cartridge which is
disposed of and replaced after one anastomotic stapling. Another
embodiment provides a slidable sleeve around the driver pin array
to prevent blood and tissue from getting caught therein.
For anastomosis to be successful, it is imperative not to injure
the living tissue being stapled by overcompressing it between anvil
114 and staple cartridge 116 or by a staple bond that is
exceedingly tight. Accordingly, overcompression of the tissue is
prevented in the present invention by limiting the length of driver
pins 118. Other embodiments are known in the prior art for
accomplishing this objective. For example, U.S. Pat. No. 4,575,468
employs mutually coacting stops located on the inner surface of a
tubular housing and on the surface of a coaxial rod to provide
variable degrees of engagement between tissues to be stapled so as
to ensure against overcompression of the tissue. A spring-loaded
engagement between the rod and tubular housing, is also applicable
for the present invention. Other means suitable for this purpose
will be apparent to those having ordinary skill in the art.
Finally, FIG. 7 illustrates threaded end 124 of rod base 106 which
extends beyond the length of housing 102 to threadedly engage with
cylindrical nut 126 which has internally threaded throughbore 120
extending the full length of cylindrical nut 126 to allow end 124
to exit therethrough.
FIGS. 8 and 9 illustrate the mechanical interaction between the
staple driver, staple cartridge and anvil upon engagement. FIG. 8
illustrates staple driver array 200 mounted on face 202 of tubular
housing 204 slidably engaged within staple shaft array 206 of
staple cartridge 208. Staple array 210 is projected from staple
cartridge 208 and through the tissues to be stapled (not shown).
FIG. 9 shows a close-up of a staple being driven by driver pin 252
and projecting through cartridge 254 through tissues 256 and 258.
The legs 260 and 262 of staple 250 then engage with and bend along
the curved recesses 264 and 266, respectively, of anvil 268 to form
a bond between tissues 256 and 258.
Referring now to FIGS. 10-16, with like numbers referring to like
elements, there is illustrated the steps of the anastomotic
procedure using the structural embodiment described above. Now
referring to FIG. 10 specifically, the anvil-headed end of rod base
302 is inserted into transected vein 304 having a length in the
range of 10-18 cm (4-7 inches). End 308 (the end to be stapled) of
vein 304 is positioned proximate to anvil 306. Opposing end 310 of
vein 304 is tied with string, 312 to central rod 314 at a
circumferential depression (not shown) proximate to base 302.
FIG. 11 shows the step of inserting central rod 314 with attached
vein 304 into staple cartridge 318 and tubular housing 316 such
that staple cartridge 318 is proximate to anvil 306. FIG. 12
illustrates the next several steps of the method of the present
invention which can be performed in any order. The end of vein 304
is everted over staple cartridge 318 and tied with string 320
securing it to staple cartridge 318 (covered by vein 304). Threaded
stem 322 of cylindrical knob 324 is threadedly engaged with a
threaded bore (not shown) base 302, the bore being aligned with
narrow channel 326. Cylindrical nut 328 is threadedly engaged with
the threaded end 300. As indicated in FIG. 13, anvil 306 is
positioned within lumen 330 of vascular artery 332 via incision
334. A cross-section of a portion of vein 304 is shown everted over
the staple delivery end of staple cartridge 318.
In FIG. 14, central rod 314 (not visible) and rod base 302 (not
visible) are optimally coaxially positioned within tubular housing
316 by means of sliding knob 324 along channel 326 toward vascular
artery 332. Nut 328 is rotated in a clockwise direction to engage
it with tubular housing 316 causing rod base 302 to become rigidly
interconnected with nut 328. As the clockwise turning continues,
rod base 302 is drawn through the bore in nut 328, bringing the
staple cartridge 336 and anvil 306 within artery 332 together. An
embodiment employing mutually coacting stops (not shown) would, at
this point, be at the first coacting position or the "loaded"
position. The clockwise motion is continued so that everted vein
304 engages with the wall of artery 332 and until the staple
drivers (not visible) are actuated, driving the staples (not
visible) through the tissues to create a bond 338 (FIG. 15). If
mutually coacting stops are employed, the configuration would be in
the "firing" position.
Finally, FIG. 16 illustrates heart 350 having aorta 352, pulmonary
artery 354, right atrium 356, right ventricle 358, left ventricle
360, left atrial appendage 362, right coronary artery 364, left
anterior descending artery 368, and diagonal artery 370. Here, vein
304 has been anastomotically stapled to left anterior descending
artery 368.
To complete the anastomotic procedure of the bypass vein 304, the
unstapled end of the anastomotized vein 304 must now be connected
to aorta 352. However, another structural embodiment of the present
invention, referred to as the "proximal" stapler, is needed since
the embodiment described above, i.e., the "distal" stapler,
requires the vein to have two distal or untethered ends.
Accordingly, FIGS. 17-28 describe a structure and method thereof
for a second embodiment of the present invention which is suited
for the anastomotic stapling of a tubular vessel having only one
distal end, the other end having already been anastomotically
stapled.
Referring now to FIGS. 17-19, with like numbers referencing like
elements, there is shown anastomotic stapler 400 having handle 402
with elongated vessel rod 404 and elongated driver rod 406 mounted
perpendicularly to handle face 408 and parallel to each other, both
being of approximately the same length. Vessel rod 404 has a
centrally mounted generally circular anvil 410. Vessel rod 404 has
a circumference sufficient to coaxially accommodate a tubular
vessel (not shown) to be stapled to the aorta. Driver rod 406,
having threaded end 412 and handle 414, extends through bore 416 of
handle 402.
Stapler 400 also comprises staple cartridge 418, enlarged in FIG.
18 for purposes of describing its detail. Referring then to FIG.
18, there is shown the staple cartridge of FIG. 17 in its open
position having top and bottom units 420 and 422, respectively.
Units 420 and 422 are engaged at one side by hinge 424 which allows
cartridge 418 to be opened and closed. Staple cartridge 418 has two
parallel bores 426 and 428 with inner circumferences sufficient to
coaxially accommodate vessel rod 404 with a coaxially accommodated
vein (not shown) and driver rod 406, respectively. Staple delivery
end 430 extends from staple cartridge 418 along the axis of bore
426 to accommodate the everted end of a vein to be stapled. Bore
428 is internally threaded to be threadedly engagable with driver
rod end 412.
For a proper fit between units 420 and 422, a detent-recess pair is
provided having detent 432 extending from inner surface 434 of top
unit 420 which mates with recess 436 within inner surface 438 of
bottom unit 422. To secure closing, a curved clip 440 is provided
to fit around cylindrical casing 442 of bore 428.
When in a closed position, staple cartridge 418 has cylindrical
staple delivery means or staple shaft array (not shown) encased in
staple delivery end 430 which mates with cylindrical driver pin
array 444 mounted on driver 446. Both the hollow shafts and the
solid driver pins have height and width measurements that allow
them to be slidably engageable with each other. Driver 446 is
slidable along surface 448 of top unit 420 and surface 450 of
bottom unit 422 to the point of engagement with shoulder 452 of top
unit 420 upon which driver pin array 444 becomes engaged within the
staple shaft array, projecting preloaded staples from the end of
staple delivery end 430. Shoulder 452 limits the engagement of
driver pin array 444 so that the tissue being stapled is not
overcompressed. Modifications of the this embodiment can employ
mutually coacting stops or spring-loaded type configurations
between the driver and staple cartridge to prevent against
overcompression of the tissue.
FIG. 19 shows a front view of staple cartridge 418 in its closed
position with top unit 420 engaged with bottom unit 422. Clip 440
securely fits around cylindrical casing 442. Staple deforming end
or staple shaft array 454 is shown on the face of staple delivery
end 430.
FIGS. 20-28, with like numbers referencing like elements, depict
the various steps of the anastomotic procedure using the structural
embodiment in FIGS. 17-19 described above. Referring now to FIG.
20, vessel rod 500 is inserted through aorta 502 of heart 504 via
incisions 506 and 508 on opposing walls of aorta 502 such that
anvil 510 is centrally positioned within aorta 502.
In FIG. 21, the end of vessel rod 500 is then inserted into the
distal end of vein 512 with anvil 510 still centrally positioned
within aorta 502. Next, as shown in FIG. 22, vessel rod 500 with
accommodated vein 512 is positioned within the corresponding bore
514 in open staple cartridge 516. Rod 500 and vein 512 should be
positioned such that a sufficient length of distal end 518 of vein
512 extends beyond the end of cartridge 516 such that distal end
518 can be everted over cylindrical sleeve 520 of cartridge 516
(See FIG. 23). Once vein 512 has been optimally positioned, staple
cartridge 516 is clamped around it and secured with clip 522,
illustrated in FIG. 24. Now, distal end 518 of vein 512 is everted
over sleeve 520 and is securely tied with string 524.
Referring now to FIG. 25, driver rod 526 is slid into bore 528 of
handle 530 and then threadedly engaged with bore 532 of staple
cartridge 516. FIG. 26 shows a close-up of staple cartridge 516 as
it appears in its closed position.
Moving now to FIG. 27, there is shown driver handle 534 rotated in
a clockwise direction, bringing together anvil 510 and cylindrical
sleeve 520. The clockwise rotation is continued until the aorta
wall 502 is engaged with the distal end 518 of vein 512 upon which
the staple driver pins (not visible) are fully engaged within each
of the corresponding staple shafts (not visible), driving the
staples (not visible) through the engaged tissue to create
anastomotic bond 536 between aorta 502 and vein 512 (See FIG.
28).
Referring to FIG. 29, another stapler 600 is shown. The stapler 600
advantageously provides an actuator 602 for compressing the tissue
layers to be stapled and a trigger 604 for firing the staples (not
shown). By providing both the actuator 602 and trigger 604, the
amount of tissue compression can be controlled independent of
staple firing.
The stapler 600 includes a handle 606 with the actuator 602 being
rotatably coupled to the proximal end of the handle 606. The
actuator 602 has a groove 608 which engages a set screw 610 in the
handle 606 so that the actuator 602 can only rotate relative to the
handle 606. A rod 612 is threadably coupled to the handle 606 so
that rotation of the actuator 602 moves the rod proximally and
distally. The rod 612 extends through a housing 614 and an anvil
616 is connected to the distal end of the rod 612. As will be
discussed in further detail below, the actuator 602 is rotated to
move the anvil 616 relative to a shoulder 618 of the housing 614
for compressing the tissue layers to be stapled.
The trigger 604 is pivotally coupled to the handle 606 and
actuation of the trigger 604 fires the staples (not shown) as will
be described in further detail below. The trigger 604 engages a
driver 620 which is biased toward the position of FIG. 29 by a
spring 622. A stop 624 limits rotation of the trigger 604 beyond
the position in FIG. 29. The driver 620 contacts and drives a shaft
626 which extends toward the distal end. The driver 620 preferably
has a throughhole 628 having a square cross-sectional shape (not
shown) through which the rod 612 extends. The rod 612 has a
complementary square cross-sectional shape at a portion extending
through the throughhole 628 to prevent rotation of the rod 612. The
housing 614 also includes a tube 630 and a guide 634 which has the
shoulder 618. The tube is connected to the handle 606 by another
set screw 632.
Referring to FIG. 30, the distal end of the stapler 600 is shown.
The distal end of the shaft 626 engages a staple pusher 636. The
staples (not shown) are positioned in cavities 638 and are driven
toward recesses 640 in the anvil 616. The staple pusher 636 is
slidably coupled to the guide 634 which guides the staple pusher
636 and defines the cavities 638 in which the staples are
positioned. The guide 634 is preferably coupled to the tube 630 by
a compression fit but may be connected to the tube 630 in any other
manner. When the anvil 616 is moved toward the proximal end by
rotation of the actuator 602, the tissue layers are compressed
between the anvil 616 and the shoulder 618 of the guide 634 as will
be described below in connection with FIG. 36.
Referring to FIG. 31, a cross-sectional view of FIG. 30 is shown
along line I--I. The guide 634 preferably includes at least five,
and more preferably at least six, cavities 638, however, any number
of cavities 638 may be provided. The staple pusher 636 includes
staple drivers 642 which are positioned in the cavities 638 and
extend radially outwardly from a central tube 644. Referring to
FIG. 32, another cross-sectional view of FIG. 30 is shown along
line II--II. The recesses 640 of the anvil 616 are positioned and
shaped to engage and deform the staples being driven from the
cavities 638 and have a cross-sectional shape as shown in FIG. 4.
The cavities 638 and recesses 640 may have any other configuration,
including the tear drop shape of FIGS. 5 and 6, without departing
from the scope of the invention.
Referring to FIGS. 33-34, a preferred staple 646 is shown. The
staple 646 includes a tissue compressing portion 648 extending
between legs 449 for compressing the tissue layers being stapled.
The tissue compressing portion 648 has a height A of preferably
0.040 inches while the overall height B of the staple is preferably
0.125 inches. The height A of the tissue compressing portion is
preferably at least 15%, and more preferably at least 25%, and most
preferably at least 30% of the overall height B of the staple 646.
The tissue compressing portion 648 is preferably solid between a
top 650 and bottom 652 of the staple 646 so that the staple 646 is
more rigid, however, the tissue compressing portion 648 may also be
hollow between the top 650 and bottom 652. The bottom 652 of the
tissue compressing portion 648 may also include tissue engaging
features, such as atraumatic ridges, for securely grasping the
tissue. The tissue compressing portion 648 permits controlled
compression of the tissue while the top 650 of the staple 646 is
still engaged by the staple pusher 636 for stability.
The staple 646 preferably includes a notch 654 which ensures that
the legs 649 bend at the desired location. The legs 649 preferably
have a width C of 0.010 inches. The sharp distal end of each leg is
beveled at about 45.degree. and the notch 654 is preferably a
distance D of 0.025 inches from the sharp distal end. The notch 654
preferably has a radius of curvature of about 0.005 inches.
Referring to FIG. 34, the staple 646 preferably has a thickness E
of 0.010 inches and a width F of 0.072 inches. Although the
dimensions given above are preferred, the staple 646 may have any
other dimensions without departing from the scope of the
invention.
Operation of the stapler 600 is now described in connection with
attaching a graft 660 to a blood vessel such as an aorta or a
coronary artery. Referring to FIG. 35, the rod 612 is detached from
the stapler 600 by rotating the actuator 602 until the rod 612 is
decoupled from the actuator 602. The graft 660, which can be either
synthetic or natural, is then fitted over the rod 612 with a suture
656 securing the proximal end of the graft 660 to the rod 612. The
rod 612 is then reattached to the actuator 602 so that the graft
660 is positioned almost entirely within the stapler 600.
Referring to FIG. 36, the distal end of the graft 660 is everted
around the shoulder 618. The anvil 616 is then pushed through the
opening in the body structure 662, which may be an aorta or a
coronary artery, to which the graft 660 is being attached. The
actuator 602 is then rotated to compress the body structure 662 and
graft 660 between the anvil 616 and shoulder 618 as shown in FIG.
37. An advantage of the stapler 600 is that the compressive force
on the graft 660 and body structure 662 may be controlled
independent of staple firing. Although it is preferred to movably
couple the anvil 616 to the handle 606, the anvil 616 may be fixed
to the handle 606 and the shoulder 618 may be movably coupled to
the handle 606 for compressing the tissue layers.
Referring still to FIG. 37, the trigger 604 is manipulated to drive
the staple pusher 636 and fire the staples 646. The staples 646 are
forced against the recesses 640 of the anvil 616 and buckle at the
notches 654 (FIG. 34). After the staples 646 have been fired, the
actuator 602 is rotated to release compression of the tissue
between the anvil 616 and shoulder 618. The anvil 616 and rod 612
are then removed from the graft 660 and the other end of the graft
660 is attached to another body structure, such as an aorta or a
coronary artery, thereby completing the graft procedure.
Referring to FIG. 38, yet another stapler 700 is shown. The stapler
700 includes similar features to the stapler 600 of FIGS. 29-37 and
like reference numerals refer to like structure. The stapler 700
includes a handle 706 having an actuator 702 at the proximal end.
The actuator 702 has a groove 708 which engages a set screw 710 for
rotatably coupling the actuator 702 to the handle 706. A rod 712 is
threadably coupled to the handle 706 so that rotation of the
actuator 702 moves the rod 612 proximally and distally. An anvil
716 is connected to the distal end of the rod 612. Rotation of the
actuator 702 moves the anvil 716 towards and away from a shoulder
718 of a housing 714 to control compression of tissue layers
positioned therebetween as discussed above in connection with the
stapler 600.
A trigger 704 is pivotally coupled to the handle 706 and actuation
of the trigger 704 fires the staples (not shown). The trigger 704
engages a driver 720 which is biased toward the open position of
FIG. 40 by a spring 722. A stop 724 limits rotation of the trigger
704 beyond the position in FIG. 40. The driver 720 contacts and
drives a shaft 726 which extends toward the distal end. A tube 630
is also connected to the handle 706 by another set screw 732.
The anvil 716 is expandable from the collapsed position of FIG. 39
to the expanded position of FIG. 40. The anvil 716 is easier to
withdraw through the graft after stapling is completed since the
anvil 716 can assume the collapsed shape of FIG. 40. The expandable
anvil 716 is moved from the collapsed shape to the expanded shape
by an expander 717 which extends through the rod 712. The expander
717 is coupled to a knob 719 at the proximal end. The knob 719 is
rotatably coupled to the actuator 702 so that rotation of the knob
719 moves the expander 717 distally and proximally. The distal end
of the expander 717 has a conical member 721 which engages the
anvil 716 to expand the anvil 716 as will be described in greater
detail below. The expander 717 preferably has a square
cross-sectional shape (not shown) at a portion 721 passing through
the distal end of the rod 712 with the distal end of the rod 612
having a complementary shaped square throughhole 723. The square
cross-sectional shape of the expander 711 and throughhole 723
prevent rotation of the expander 717 so that rotation of the knob
719 translates into longitudinal motion of the expander 717.
A distal portion 725 of the rod 712 has a reduced diameter so that
the rod 712 is more flexible thereby permitting movement from the
collapsed position to the expanded position. Referring to FIG. 39,
the distal end of the stapler 700 is shown. The distal end of the
shaft 726 engages a staple pusher 736. The staples (not shown) are
positioned in cavities 738 and are driven toward recesses 740 in
the anvil 716. The staple pusher 736 and guide 734 are the same as
described above in connection with FIGS. 30-32.
Referring to FIG. 41, a cross-sectional view of FIG. 38 along line
III--III is shown. The expander 717 and anvil 716 are shown with
the anvil 716 in the collapsed position. The anvil 716 preferably
has at least four, more preferably at least five, and most
preferably at least six anvil segments 716A. The rod 712 is split
longitudinally along the distal portion 725 (FIG. 38) into six
corresponding rod sections 712A (FIG. 40) which each carry one of
the anvil segments 716A. FIG. 40 shows two of the rod segments
712A. The rod segments 712A act as springs which permit deflection
of the distal portion of the rod 712. The rod segments 712A bias
the anvil segments toward the collapsed position of FIG. 39.
Referring again to FIG. 41, the expander 717 includes ribs 731
which engage slots 733 in the anvil segments 716A to ensure proper
spacing between the anvil segments 716A and prevent displacement of
the anvil segments 716A when the staples are fired.
Referring to FIG. 42, a cross-sectional view of FIG. 39 along line
IV--IV is shown. The expander 717 is moved toward the proximal end
so that the larger diameter portion of the conical member 721
engages the anvil segments 716A and biases the rod segments 712A
outwardly as shown in FIG. 39. Each of the anvil segments 716A
include one of the recesses 740 shown in FIG. 32 and the recesses
740 are positioned and shaped to engage and deform the staples
being driven from the cavities 738 when the anvil 716 is in the
expanded position. The anvil segments 716A preferably have a plan
area in the collapsed shape which is smaller than the plan area of
the recesses when the anvil segments 716A are in the expanded
position so that the anvil segments 716A may be easily withdrawn
from the stapled area after stapling is completed. The cavities 738
and recesses 740 may be in any other configuration, such as the
tear drop shape of FIGS. 5 and 6, without departing from the scope
of the invention. The stapler 700 preferably uses the staple 646
described above in connection with FIGS. 34-36, however, any other
staple may be used.
Operation of the stapler 700 is now described. The stapler 700
operates in essentially the same as the stapler 600 except for use
of the expander 717. The rod 712 is decoupled from the actuator 702
and the expander 717 is decoupled from the knob 719. The rod 712 is
then passed through the graft 760 with the anvil 716 in the
collapsed shape. The rod 712 and expander 717 are then reattached
to the actuator 702 and knob 719. The distal end of the graft 760
is everted around the distal end of the guide 734 and the anvil 716
is pushed through the opening in the body structure to which the
graft 760 is being attached. The knob 719 is then rotated so that
the expander 717 moves distally and expands the anvil 716 to the
expanded position of FIG. 40. Alternatively, the anvil 716 may be
positioned in the expanded position before inserting the anvil 716
into the body structure. The actuator 702 is then rotated to
compress the body structure and graft between the anvil 716 and
shoulder 718. The trigger 704 is then actuated to drive the staple
pusher 736 and fire the staples against the anvil segments 716A.
After the staples have been fired, the actuator 702 is rotated to
release compression of the tissue between the anvil 716 and
shoulder 718 and the knob 719 is rotated to move the expander 717
distally thereby causing the anvil segments 716A to move to the
collapsed position. The anvil 716 and rod 712 are then removed from
the graft 760 and the other end of the graft 760 is attached to
another body structure, such as an aorta or a coronary artery,
thereby completing the graft procedure.
It will be understood that the foregoing is only illustrative of
the principles of the present invention, and that various
modifications can be made by those skilled in the art without
departing from the scope and spirit of the invention. For example,
the particular stapler structural configurations shown are not
critical and other configurations can be used if desired. One
possible alternative for the configuration illustrated in FIG. 17
is to have a vessel rod that is retractable (e.g., by means of a
telescoping rod). In addition, the vessel rod of this alternative
embodiment can be curved to facilitate the anastomotic procedure if
necessary. Also, the structure and method of the present invention
can be employed thoracoscopically.
* * * * *